.container {
  width: 60%;
  margin: 0 auto;
  background-color: aqua;
  min-height: 220px;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.2);
}

h2 {
  text-align: center;
  padding-top: 10px;
  color: #000;
}

p {
  width: 90%;
  margin: 0 auto;
  text-align: center;
  font-size: 16px;
}

input {
  box-sizing: border-box;
  width: 60px;
  padding: 5px;
  font-size: 16px;
}

button {
  padding: 5px 10px;
  font-size: 16px;
  background-color: #ccc;
  border: none;
  cursor: pointer;
}

button:hover {
  background-color: #aaa;
}

p#result {
  margin: 20px auto;
  height: 40px;
  width: 75%;
  padding: 20px;
  border: 1px dotted gold;
  background-color: rgb(221, 220, 220);
  font-weight: bold;
  text-align: center;
  font-size: 18px;
}